Recently it was found that the superposition of a strong and slow electric field with a weaker and faster pulse can significantly enhance the probability for nonperturbative electron-positron pair creation out of the vacuum---the dynamically assisted Sauter-Schwinger effect. Via the WKB method, we estimate the momentum dependence of the pair creation probability and compare it to existing numerical results. Besides the theoretical interest, a better understanding of this pair creation mechanism should be helpful for the planned experiments aiming at its detection.
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Fey et al. (2012) studied this question.
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